Allison Transmission Shift Selector 29551556

Allison 4th/5th Gen Shift Selector Assembly 29551556

Code: 29551556

Allison 4th/5th Gen Shift Selector Assembly 29551556

Reaction Force LLC provides FREE BENCH TESTING and over-the-phone diagnostics. Questions about your TCM? Call us at (503) 862-6322.

Condition: New

Recalibration: Included

Compatible years: 2006-2016

Warranty: 6 months

$877.93

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Description

Allison Shift Selector 29551556 4th/5th Gen Pushbutton Assembly

Compatible years: Approx. 2006–2024

Condition: New

The Allison 29551556 is a pushbutton shift selector assembly used in 4th and 5th Generation Allison transmissions. Found in a wide range of commercial and vocational vehicles, this unit allows the driver to select gears electronically and communicates directly with the transmission control module (TCM).

This is a direct replacement for failing or unresponsive pushbutton selectors in Gen 4/5 equipped vehicles.

Common symptoms of a bad shift selector

  • Shift pad does not light up

  • Buttons are unresponsive or sticky

  • Incorrect or flashing gear display

  • Vehicle won’t shift out of neutral

  • Codes like P0919, P0700, or U0101 appear

  • Limp mode or “Do Not Shift” messages on display

These issues often point to either a failed selector unit or loss of communication between the selector and TCM.

Pre-replacement checklist

Before replacing your shift pad, check:

  1. Power to the selector – Test voltage at the connector

  2. Grounds and ignition feed – Confirm clean and secure

  3. Communication with TCM – Scan for U-codes

  4. Water intrusion or corrosion – Common failure cause

  5. Try known-good selector if available or use Reaction Force’s free bench testing

Call (503) 862-6322 for diagnostics.

Related diagnostic trouble codes

These are commonly triggered when the selector fails or loses communication:

  • P0700 – Transmission system fault

  • U0101 – Lost communication with TCM

  • P0919 – Gear shift position circuit fault

  • P0826 – Up/down shift switch input fault

  • 2312 – Shift selector failure (specific to selector hardware)

If these codes are present and the shift pad is non-functional, replacement is likely required.

Installation notes

  • Disconnect battery before installation

  • Mount securely in dash with factory hardware

  • Connect wiring harness securely—check pins for damage or corrosion

  • If necessary, program the selector via TCM software after install

  • Clear any stored codes and verify proper display function before road test

Need help?

Reaction Force provides:

  • Free bench testing

  • Over-the-phone diagnostics

  • Help identifying Gen 4 vs. Gen 5 compatibility

  • Installation guidance and code support

Call (503) 862-6322

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Images are for representation purposes only. For reman and RTO purchases a photo of the actual item you are receiving will be sent for approval prior to shipping.

Please see our warranty, shipping, refund, and return policies.

Frequently asked questions

1. What does the 29551556 shift selector do?
It allows the driver to control the Allison transmission electronically through pushbutton inputs and communicates directly with the TCM.

2. How do I know if the selector is bad?
Common signs include no display, stuck buttons, incorrect gear readout, or gear selection failure.

3. Do I need to program this part?
In many cases, no—but some vehicles may require a brief calibration through the TCM.

4. What transmissions is this compatible with?
It works with Allison 1000–4000 Series transmissions using 4th or 5th Gen controls (2006–2024).

5. Will it work in my school bus/fire truck/commercial van?
Yes, if your vehicle uses a 4th or 5th Gen TCM with pushbutton shifting. Contact us to confirm fitment.

Additional information

Weight 2.75 lbs
Dimensions 9 × 9 × 4 in
Applications for 29551556

This selector is used in Allison transmission families: 1000 Series 2000 Series 3000 Series 4000 Series
Common vehicles

Chevy and GMC HD pickups with pushbutton shift Freightliner MT chassis (delivery/step vans) Isuzu FTR/N-Series trucks Blue Bird and Thomas Built school buses Fire trucks, refuse trucks, and utility vehicles RVs and commercial transport vehicles Note: Compatible with both Gen 4 and Gen 5 TCMs when programmed properly.
Product specifications

Part number: 29551556 Type: Pushbutton shift selector Compatibility: 4th and 5th Gen TCM systems (2006–2024) Condition: Used, good. Bench-tested Programming: May require calibration depending on vehicle platform Warranty: 6-month limited warranty

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    The Allison 29522940 is a WTEC II pushbutton shift selector used with Allison automatic transmissions in medium- and heavy-duty applications. This is the integral-style selector configuration, designed for dashboard mounting with a ribbon connector at the rear of the unit.

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    Free Bench Testing

    Already have a 29522940 that isn’t working correctly? Send it to Reaction Force for free bench testing. You pay only the shipping.

    Our reman units are bench-tested for proper functionality, including display operation and button response.

    Please review our Core Policy

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